Remote I/O Scanner. (Catalog Number 1747-SN) Product Data

Transcription

1 (Catalog Number 1747-SN) Product Data Surpass the present control capabilities of your SLC 500 processor (SLC 5/02 or later) by installing the Allen-Bradley Remote I/O (RIO) link. At communication rates up to 230.4K baud, the provides connectivity of your SLC 500 processor to Allen-Bradley operator interface devices, drives, and 1771 I/O products. Reduce your wiring costs in remote applications with the time-proven Remote I/O (RIO) link. The RIO link enables the SLC 500 processor to exchange input and output information with up to 32 devices (nodes) via a single twisted pair cable. In addition to remote communication with 1746, 1771, and 1794 (Flex I/O) I/O systems, the Remote I/O scanner also enables communication with 1791 Block I/O. This reduces the amount of wiring and the time needed for installation. Take advantage of the scanner s increased data transfer capability. The RIO scanner supports both block and discrete I/O transfer in normal and complementary configurations. This flexibility allows the scanner to handle a variety of applications.

2 Features and Benefits Selectable baud rates. Provides you the ability to choose the communication rate which gives optimum performance and noise immunity over various cable distances. RIO link cable of 3,048 meters (10,000 feet) maximum. Devices can be distributed over a wide physical area, increasing your application possibilities. Time proven Allen-Bradley Remote I/O link architecture. By offering a wide range of compatible RIO Allen-Bradley devices, the amount of data transferred increases your application potential. Block transfer read and write capability. Allows the scanner to exchange large amounts of data (up to 64 words) with any Allen-Bradley or Pyramid Solution Partner (PSP) compatible devices that use block transfer. For example, 1771 analog I/O and Allen-Bradley drives. Extended node capability. Allows you to connect up to 32 physical devices (nodes) on an RIO link, increasing your application capabilities. Complementary I/O. This feature allows you to configure your system to more efficiently use the scanner s I/O image. This maximizes the number of I/O that can be controlled by the scanner. Remote connectivity to 1746, 1771, 1794 (Flex I/O) and 1791 Block I/O. Increases your application capabilities by communicating with any and all remote I/O devices. What s Inside... Page System Overview 3 Asynchronous Operation 4 Scanner Interaction with Adapters 5 Hardware Overview 6 RIO Link Wiring 6 Scanner Programs (G and M Files) 8 Image Concepts 9 Block Transfer 11 Application Example 13 Support Services 20 Specifications 21 2

3 System Overview The Remote I/O (RIO) Scanner, Catalog Number 1747-SN, is the remote I/O scanner for the SLC 500. It enables communication between an SLC processor (SLC 5/02 or later) and remotely located (3,048 meters [10,000 feet] maximum) 1746 I/O chassis and other RIO compatible Allen-Bradley operator interface and control devices. The 1747-SN Scanner communicates with remotely located devices using the A-B Remote I/O link. The RIO link consists of a single master (scanner) and multiple slaves (adapters). Communication between devices occurs over twisted pair cable with the devices daisy-chained together. The scanner can reside in any slot of the local SLC chassis except for slot 0. SLC 5/02 or Later Processor RIO Scanner (Master of the RIO Link) The scanner transfers input and output data between itself and all configured network devices over twisted pair cable. Note that the end-to-end length of the cable can be a maximum of 3,048 meters (10,000 feet) ASB Module (Adapter/Slave) Local SLC Chassis Remote 1746 Chassis Remote 1746 Expansion Chassis Dataliner Message Display (Adapter/Slave) PanelView Operator Terminal (Adapter/Slave) RediPANEL (Adapter/Slave) When installed in an SLC 500 modular system using an SLC 5/02 (or later) processor, the scanner supports up to 4 logical racks of data (up to 16 physical devices in normal mode; up 32 devices in complementary mode) on the RIO link. The scanner provides discrete and block I/O transfers to any combination of quarter, half, three quarter, or full logical rack devices. The SLC system supports multiple scanners in the SLC 500 processor chassis. The number depends on your processor memory and power supply capability. 3

4 SLC and Scanner Asynchronous Operation The SLC processor scan and RIO scanner scan are independent (asynchronous) of each other. The SLC processor reads the scanner input image file during its input scan and writes the output image file to the scanner during its output scan. The RIO scanner continues reading inputs and writing outputs to the scanner I/O image file, independent of the SLC processor scan cycle. Depending on your SLC processor, RIO link configuration, and application program size, the scanner may complete multiple scans before the SLC processor reads the scanner s input image file. The RIO scanner updates its I/O files on a per logical rack basis. The figure below illustrates the asynchronous operation of the SLC processor and RIO scanner. SLC Processor Scan Cycle RIO Scanner Scan Cycle The SLC processor reads the scanner input image file into the SLC input image file, processes it, and creates an SLC output image file. The SLC processor transfers its output file to the scanner. Program SLC Input Image File Scanner Input Image File Input Image Device 3 Output Image Device 3 Output Image Device 2 Input Image Device 1 Input Image Device 2 Output Image Device 1 The scanner updates its input image file each time it scans a logical device. The scanner may scan all of its configured logical devices several times before the SLC processor reads the scanner s input image file. SLC Processor SLC Output Image File Scanner Output Image File Important: The outputs of the RIO are updated after the end of the first SLC processor scan. 4

5 How the Scanner Interacts With Adapters The scanner s function is to continuously scan the adapters on the RIO link in a consecutive manner. The scan consists of one or more RIO discrete transfers to each adapter on the RIO link. RIO discrete transfers consist of the scanner sending output image data and communication commands to the adapter that instruct the adapter on how to control its output. (These include run, adapter reset, and reset decide commands.) The adapter responds by sending input data to the scanner. The scanner performs as many RIO discrete transfers as necessary to update the entire adapter image. If RIO discrete transfers do not occur, data is not exchanged between the scanner and adapter. Important: RIO discrete transfers are asynchronous with the processor scan. Processor Scanner ASB Module SLC Local Chassis RIO Discrete Transfers with Adapter 1 RIO Discrete Transfers with Adapter 2 Remote Chassis Remote Expansion Chassis RIO Link PanelView Operator Terminal ASB Module RIO Discrete Transfers with Adapter 3 Remote Chassis Remote Expansion Chassis RIO Discrete Transfers with Adapter 4 RediPANEL 5

6 Hardware Overview The scanner easily installs in an SLC chassis like other SLC 500 discrete I/O and specialty modules. Diagnostic LEDs indicate scanner operating status. The FAULT LED indicates the overall operating status of the scanner and the COMM LED indicates the RIO link communication status. The scanner communicates over the RIO link via Belden cable #9463. The cable connects to the scanner through a removable terminal on the front of the module. (Refer to the RIO link connector in the diagram on the following page.) Baud Rate DIP Switch ➀ 12 O N 12 O N 57.6K baud 115.2K baud 12 O N 12 O N 230.4K baud 230.4K baud ➀ This is the default position as shipped from the factory. RIO Link Wiring The scanner is connected to other devices on the RIO link in a daisy chain (serial) configuration. There are no restrictions governing the space between each device, provided the maximum cable distance (Belden 9463) is not exceeded. A 1/2 watt terminating resistor (included with the module) must be attached across line 1 and line 2 of the connectors at each end (scanner and last physical device) of the RIO link. The value of the resistor depends on the baud rate and extended node capability, as shown in the table that follows. 6 Using Extended Node Capability Not Using Extended Node Capability Baud Rate Important: To use extended node, all devices on the RIO link must support it. Refer to each device s user manual. All Baud Rates 57.6K baud 115.2K baud 230.4K baud Terminating Resistor Size 82 1/2 Watt Gray Red Black Gold 150 1/2 Watt Brown Green Brown Gold 150 1/2 Watt Brown Green Brown Gold 82 1/2 Watt Gray Red Black Gold Maximum Cable Distance (Belden 9463) 3048 meters (10,000 feet) at 57.6K baud 1524 meters (5,000 feet) at 115.2K baud 762 meters (2,500 feet) at 230.4K baud 3048 meters (10,000 feet) 1524 meters (5,000 feet) 762 meters (2,500 feet)

7 Allen-Bradley Compatible Devices Catalog Number Device Comments 1785-LT/x PLC-5/15 (in adapter mode) Extended node capability in adapter mode LT2 PLC-5/25 (in adapter mode) Extended node capability in adapter mode LT3 PLC-5/12 (in adapter mode) Extended node capability in adapter mode L30x PLC-5/30 (in adapter mode) Extended node capability in adapter mode L40x PLC-5/40 (in adapter mode) Extended node capability in adapter mode L60x PLC-5/60 (in adapter mode) Extended node capability in adapter mode ASC 1771-ASB 1771-AM AM F30D 1771-RIO Remote I/O Adapter Module Remote I/O Adapter Module 1-Slot I/O Chassis W/Integral Power Supply and Adapter 2-Slot I/O Chassis W/Integral Power Supply and Adapter Plant Floor Terminal Remote I/O Expansion Module Remote I/O Interface Module Series A, B, and C; extended node capability for Series B and C. Extended node capability. Extended node capability. Extended node capability JAB Single Point I/O Adapter Module Extended node capability DCM Direct Communication Module 1778-ASB Remote I/O Adapter Module Extended node capability DCM Direct Communication Module Extended node capability xxxx ➀ DL40 Dataliner Extended node capability for Series B and C xxx 2711-xx 1336-G NA RediPANEL PanelView Terminal Remote I/O Adapter for 1336 AC Industrial Drives Remote I/O Adapter for 1395 DC Industrial Drives Requires half logical rack configuration if you want to use stored messages. Extended node capability. You can address PanelView Terminals as up to four full logical racks of discrete I/O. You can also assign partial logical racks. Extended node capability. Extended node capability. Extended node capability xxx Block I/O Products The adapter is built into the block ASB 1794-ASB SLC 500 Remote I/O Adapter Module Flex I/O 24VDC Remote I/O Adapter ➀ Must be Catalog Number 2706-ExxxxxB1. Extended node capability. 7

8 Configuring the Scanner and Special Control Status Functions G Files G files are the software equivalent of DIP switches. You use the G file to configure each network device to the scanner. It specifies the address of each RIO device and the discrete data size transferred for each device. G file information is entered during SLC programming and downloaded when the scanner enters the run or test mode. G file information cannot be accessed during scanner operation. M Files The scanner provides RIO link device control and status information through M0 and M1 files. The M0 file is an output and control file. The M1 file is an input and status file. Below is a description of their functions. M0 files: stop scanning an RIO device (Device Inhibit) reset device outputs to off while in the test or run mode (Device Reset) reset device outputs to off on leaving the run mode (Remote Output Reset) control read and write Block Transfers contain Block Transfer write data M1 files provide: baud rate device and rack configurations active device status Block Transfer status information Block Transfer read data The SLC 5/03 and SLC 5/04 processors allow you to monitor the actual state of each addressed M0/M1 file in your ladder program or data table. However, the SLC 5/02 processor does not allow you to monitor the actual state of each M0/M1 address. 8

9 Scanner I/O Image Concepts The scanner s I/O image consists of RIO logical racks and I/O groups. A full RIO logical rack consists of eight input image and eight output image words. (A word consists of 16 bits of data.) Each word within an RIO logical rack is assigned an I/O group number from 0 to 7. You assign each device on the RIO link a portion of the scanner s image. Devices can occupy a quarter logical rack (2 input and output words), half logical rack (4 I/O words), three quarter logical rack (6 I/O words), or full logical rack (8 I/O words). You may configure devices to start at any even I/O group number within an RIO logical rack. More than one physical device s (adapter) I/O information can reside in a single logical rack. Also, a device can consist of more than one logical rack. Important: The illustration below shows only the input image configuration of the scanner s I/O image. The output image configuration is the same. Input Image Half of a Scanner s I/O Image Bit Number (decimal) RIO Rack 0 Rack 0 Group 0 Rack 0 Group 1 Rack 0 Group 2 Rack 0 Group 3 Rack 0 Group 4 Rack 0 Group 5 Rack 0 Group 6 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Quarter Rack Not Used In This Example Rack 0 Group 7 Word 7 RIO Rack 1 Rack 1 Group 0 Rack 1 Group 1 Rack 1 Group 2 Rack 1 Group 3 Rack 1 Group 4 Rack 1 Group 5 Rack 1 Group 6 Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Half Rack Not Used In This Example Rack 1 Group 7 Rack 2 Group 0 Word 15 Word 16 RIO Rack 2 Rack 2 Group 1 Rack 2 Group 2 Rack 2 Group 3 Rack 2 Group 4 Rack 2 Group 5 Rack 2 Group 6 Rack 2 Group 7 Word 17 Word 18 Word 19 Word 20 Word 21 Word 22 Word 23 Three Quarter Rack Not Used In This Example Rack 3 Group 0 Word 24 RIO Rack 3 Rack 3 Group 1 Rack 3 Group 2 Rack 3 Group 3 Rack 3 Group 4 Rack 3 Group 5 Word 25 Word 26 Word 27 Word 28 Word 29 Full Rack Rack 3 Group 6 Word 30 Rack 3 Group 7 Word 31 Bit Number (octal)

10 SLC 5/02 or Later Processor RIO Scanner Example Scanner I/O Image The illustrations below show a scanner s input image of 4 RIO link devices. Device 1 Device 2 Device 3 Device 4 Full Rack Device Begins at Rack 0, Group 0. Three Quarter Rack Device Begins at Rack 1, Group 0. Half Rack Device Begins at Rack 2, Group 0. Quarter Rack Device Begins at Rack 2, Group 4. RIO Rack 0 RIO Rack 1 RIO Rack 2 RIO Rack 3 Rack 0 Group 0 Rack 0 Group 1 Rack 0 Group 2 Rack 0 Group 3 Rack 0 Group 4 Rack 0 Group 5 Rack 0 Group 6 Rack 0 Group 7 Rack 1 Group 0 Rack 1 Group 1 Rack 1 Group 2 Rack 1 Group 3 Rack 1 Group 4 Rack 1 Group 5 Rack 1 Group 6 Rack 1 Group 7 Rack 2 Group 0 Rack 2 Group 1 Rack 2 Group 2 Rack 2 Group 3 Rack 2 Group 4 Rack 2 Group 5 Rack 2 Group 6 Rack 2 Group 7 Rack 3 Group 0 Rack 3 Group 1 Rack 3 Group 2 Rack 3 Group 3 Rack 3 Group 4 Rack 3 Group 5 Rack 3 Group 6 Rack 3 Group 7 Important: The illustration below shows only the scanner s input image. The output image looks the same. Bit Number Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Word 15 Word 16 Word 17 Word 18 Word 19 Word 20 Word 21 Word 22 Word 23 Word 24 Word 25 Word 26 Word 27 Word 28 Word 29 Word 30 Word 31 Bit Number (octal) e = slot number of the SLC chassis containing the scanner Input File Address I:e.0 I:e.1 I:e.2 I:e.3 Device 1 I:e.4 I:e.5 I:e.6 I:e.7 I:e.8 I:e.9 I:e.10 Device 2 I:e.11 I:e.12 I:e.13 I:e.14 Not Used I:e.15 I:e.16 I:e.17 Device 3 I:e.18 I:e.19 I:e.20 Device 4 I:e.21 I:e.22 I:e.23 I:e.24 I:e.25 I:e.26 I:e.27 Not Used I:e.28 I:e.29 I:e.30 I:e.31 10

11 Taking Advantage of Block Transfer RIO Block Transfer (BT) is a data transfer mechanism that allows your scanner to control the transfer of up to 64 words of data to or from a remote device over the Allen-Bradley RIO link. A Block Transfer Read (BTR) is used when you want to transfer data from a remote device to the SLC. A Block Transfer Write (BTW) is used when an SLC processor writes data to a remote device. Use block transfer when: A device s I/O image does not discretely fit into the scanner s I/O image. You want to maximize the number of remote devices that a single scanner can scan. A device requires block transfers for communication. You assign one byte of I/O image (which represents each logical device) to the scanner s I/O image. During block transfer execution, this one byte image acts as a handshake between the scanner and the adapter. The scanner and adapter perform block transfers through buffers that you allocate in the scanner s M0 and M1 files. processor scanner Scanner Input or Output Image Block transfer occurs via the M0 and M1 files. In these files, you allocate buffers for each logical device s image. The M0 and M1 files can accommodate up to 32 buffers of 100 words each, with data transfers up to 64 words. Bit Number Decimal Rack 0 Rack 1 Rack 2 Rack 3 Group 0 Group 1 Group 3 Group 2 ÉÉÉÉÉÉÉ Group 5 Group 4 Group 7 Group 0 Group 2 ÉÉÉÉ ÉÉÉÉ Group 6 Group 1 Group 4 Group 3 Group 6 Group 5 Group ÇÇÇÇ 7 Group 7 Group 0 Group 2 Group 4 Group 6 Group 7 ÇÇÇÇ Group 0 ÇÇÇÇ ÇÇÇÇ Group 2 ÇÇÇÇ ÇÇÇÇ Group 4 ÇÇÇÇ ÇÇÇÇ Group 6 ÇÇÇÇÇÇÇ Group 1 ÇÇÇÇ Group 3 ÇÇÇÇÇÇÇ Group 5 ÇÇÇÇ ÇÇÇÇ Group 1 Group 3 Group 5 Device A Device B Device C The block transfer length for devices A, B, and C can be up to 64 words. A token one byte I/O image is used for the block transfer. Block transfer occurs when the SLC program sets the BT Enable bit to 1. 11

12 RIO Block Transfer Functional Overview The RIO scanner performs block transfers through control/status buffers that you allocate in the scanner s M0 and M1 files. For BTWs, the M0 BT buffer contains BTW control information and BTW data, while a corresponding M1 BT buffer contains only BTW status information. For BTRs, the M0 BT buffer contains only BTR control information, while a corresponding M1 BT buffer contains BTR status information and BTR data. Block transfers occur asynchronous to RIO link discrete transfers. Note that block transfers occur as RIO scan time allows discrete I/O transfers have first priority. A total of 32 block transfer control/status buffers exist in the M0 (output/control) and the M1 (input/status) files. Block transfer buffers consist of: 3 BT control words in an M0 file BT buffer 4 BT status words in an M1 file BT buffer 64 words of BTW data in an M0 file and 64 words of BTR data in an M1 file M0 Control Buffers M0:e.100 M0:e.3200 Words words for control and 7 reserved Words words for control and 7 reserved You use an M0 file BT control buffer to initiate a BT. The corresponding M1 file displays the status of the block transfer. Words words for BT Write Data Words words for BT Write Data BT buffers reside on 100 word boundaries in the M0/M1 files starting at word 100. For example, BT buffer 1 resides at M0:e.100 and M1:e.100; BT buffer 2 resides at M0:e.200 and M1:e.200; while BT buffer 16 resides at M0:e.1600 and M1:e Note that the e in these examples refers to the physical chassis slot number in which the scanner resides. Words M1:e words for status and 6 reserved M1 Status Buffers Words M1:e words for status and 6 reserved All block transfer buffers (M0 and M1) are cleared (set to zero) either when the RIO scanner goes through a power cycle or when the SLC processor commands the scanner to change mode from Program to Test mode, Program to Run mode, or Test to Run mode. Words words for BT Read Data Words words for BT Read Data 12

13 Block Transfer Application Example In the following example, a technician is required to: install a 4 to 20 ma transducer located approximately 701 meters (2,300 feet) from an SLC 5/03 processor bring the analog input value from the remote transducer into the SLC processor as well as display the analog value on a meter at the remote location using a remote I/O chassis display 0 to 100% on the meter and accept a 4 to 20 ma signal interface to 16 discrete inputs and 16 discrete outputs at this same remote location The local system consists of: a Catalog Number 1747-L532 processor (SLC 5/03 ) in slot 0 a Catalog Number 1747-SN scanner (RIO Scanner) in slot 1 with only 1/4 logical rack of the I/O image available We assume that: the 1747-SN already has 3 3/4 of its image used with only 1/4 logical rack of image remaining, the three I/O modules must be made to fit in this image size With only 1/4 logical rack of image to work with, the remote system consists of: 4-slot remote chassis with a 1747-ASB in slot IV16 module in slot OV16 module in slot NIO4I in slot 3 For the remote chassis to keep its image size to 1/4 logical rack, select 2-slot addressing. The discrete modules use the entire image for logical rack 3, group 6 in a complementary slot pair arrangement and the combination analog module uses the image for logical rack 3, group 7. This image size for the analog module is 1 input and 1 output word short of what is required by the NIO4I module. Therefore, block transfer to/from the analog module will be used. (BT operations only require one input and one output byte.) In the future, the other analog input and output on the 1747-NIO4I may be used. 13

14 Scanner Configuration The technician addresses the 1747-ASB to logical rack 3, starting logical group 6. Since the analog module s image (2 input/output words) will not fit into one logical group (1 input/output word), he must use block transfer to read analog input values and write to analog outputs. In this example, the SLC processor will receive the analog input data via BTR, scale it, and send it to the analog output via a BTW. As shown in the G file below, the 1747-ASB consumes 1/4 logical rack of the scanner s I/O image table beginning at logical rack 3, starting at group 6. G File Device Address, Word 1 Device Size, Word 2 6 ÉÉ 1 ÉÉ1 RIO Rack 3 Starting Group RIO Rack 2 Starting Group RIO Rack 1 Starting Group RIO Rack 0 Starting Group The scanner input file is shown below. Rack 0 Rack 1 Rack 2 Rack 3 Rack 0 Group 0 Rack 0 Group 1 Rack 0 Group 2 Rack 0 Group 3 Rack 0 Group 4 Rack 0 Group 5 Rack 0 Group 6 Rack 0 Group 7 Rack 1 Group 0 Rack 1 Group 1 Rack 1 Group 2 Rack 1 Group 3 Rack 1 Group 4 Rack 1 Group 5 Rack 1 Group 6 Rack 1 Group 7 Rack 2 Group 0 Rack 2 Group 1 Rack 2 Group 2 Rack 2 Group 3 Rack 2 Group 4 Rack 2 Group 5 Rack 2 Group 6 Rack 2 Group 7 Rack 3 Group 0 Rack 3 Group 1 Rack 3 Group 2 Rack 3 Group 3 Rack 3 Group 4 Rack 3 Group 5 Rack 3 Group 6 Rack 3 Group 7 Bit Number Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8 Word 9 Word 10 Word 11 Word 12 Word 13 Word 14 Word 15 Word 16 Word 17 Word 18 Word 19 Word 20 Word 21 Word 22 Word 23 Word 24 Word 25 Word 26 Word 27 Word 28 Word 29 Word 30 Word 31 Bit Number (octal) Input File I:1.0 I:1.1 I:1.2 I:1.3 I:1.4 I:1.5 I:1.6 I:1.7 I:1.8 I:1.9 I:1.10 I:1.11 I:1.12 I:1.13 I:1.14 I:1.15 I:1.16 I:1.17 I:1.18 I:1.19 I:1.20 I:1.21 I:1.22 I:1.23 I:1.24 I:1.25 I:1.26 I:1.27 I:1.28 I:1.29 I:1.30 I:1.31 IV16 - OV16 uses O: NIO4I also uses O:1.31. = used by other devices 14

15 System Layout Diagram Local System Remote System SLC 5/03 Processor RIO Scanner RIO Link 1747 ASB 1746-IV16 Module 1746-OV16 Module 1746-NIO4I Module Output to 20 ma Analog Meter (0 to 100%) Input To Other RIO Devices 4 to 20 ma Transducer Example Program The following program samples the analog input data from the 1746-NIO4I module located in the remote I/O chassis every 100 ms by executing a BTR every 100 ms. This data is then scaled for the 4 to 20 ma output and sent back to the analog module via a BTW. The meter will then display the 4 to 20mA analog output as a 0 to 100% scale. Refer to the system layout diagram above. Also refer to the Analog Module User Manual, Catalog Number Series B for details on analog input and output ranges as well as scaling. 15

16 Rung 2:0 Configure the BT operation type, length and RIO address (R, G, S in decimal) at power-up. N7:50/7 must be set to a 1 to indicate a BTR operation and N7:53/7 must be a 0 to indicate a BTW operation. POWER UP BTR BIT CONTROL S:1 +COP + ] [ + +COPY FILE Source #N7:50 Dest #M0:1.100 Length BTW CONTROL +COP + + +COPY FILE + + Source #N7:52 Dest #M0:1.200 Length Rung 2:1 Copy the BTR status area to an integer file only when a BTR is in progress. This status data will then be used throughout the program and will limit the number of M File accesses. SERVICE THE BTR STATUS/ BTR PENDING BTR STATUS B3:0 +COP + ] [ È+COPY FILE + 0 Source #M1:1.100 Dest #N7:60 Length Rung 2:2 Copy the BTW status area to an integer file only when a BTW is in progress. This status data will then be used throughout the program and will limit the number of M File accesses. SERVICE THE BTW STATUS/ BTW BTW PENDING STATUS B3:0 +COP + ] [ È+COPY FILE + 1 Source #M1:1.200 Dest #N7:64 Length

17 Rung 2:3 When a BTR successfully completes, buffer the block transfer data and unlatch both the BTR enable bit and the BTR pending bit. The data in this example is from analog input 0 located at remote address: Rack 3, Group 7, left slot (0). This analog input is 4 to 20mA input from a transducer. VIRTUAL BTR DONE BIT BTR DATA N7:60 +COP + ] [ + +COPY FILE Source #M1:1.110 Dest #N7:10 Length SERVICE THE BTR STATUS/ BTR PENDING B3:0 + (U) + 0 BTR ENABLE BIT M0: (U) + 15 GOOD BTR DATA BIT B3:0 + (L) + 2 Rung 2:4 When a BTW successfully completes, unlatch the BTW enable bit and the BTW pending bit to complete a BTW sequence. SERVICE THE BTW VIRTUAL STATUS/ BTW DONE BTW BIT PENDING N7:64 B3:0 ] [ È + (U) BTW ENABLE BIT M0: (U)

18 Rung 2:5 If a BTR errors, unlatch the BTR enable bit and the BTR pending bit. In addition, the BTR error code (N7:63 OR M1:1.103) must be viewed or buffered to determine the cause of the error. SERVICE THE BTR STATUS/ BTR ERROR BTR BIT PENDING N7:60 B3:0 ] [ È + (U) BTR ENABLE BIT M0: (U) + 15 Rung 2:6 If a BTW errors, unlatch the BTW enable bit and the BTW pending bit. In addition, the BTW error code (N7:67 OR M1;1.203) must be viewed or buffered to determine the cause of the error. BTW ERROR BTW ENABLE BIT BIT N7:64 M0:1.200 ] [ È + (U) SERVICE THE BTW STATUS/ BTW PENDING B3:0 + (U) + 1 Rung 2:7 Free-running timer to execute a BTR to the analog input in Rack 3, Group 7 left slot every 100ms (0). T4:0 +TON + ]/[ +ÈTIMER ON DELAY + (EN) DN Timer T4:0+ (DN) Time Base 0.01 Preset 10 Accum Rung 2:8 Initiate a BTR every 100ms as long as a BTR is not in progress. A complete cycle requires that when complete or error, the ladder program unlatches the enable bit and the scanner then unlatches the done bit. A new BTR must not be initiated until these conditions occur. SERVICE THE BTR STATUS/ BTR ENABLE BTR DONE BTR BIT BIT PENDING T4:0 M0:1.100 M1:1.100 B3:0 ] [ ]/[ ]/[ È + (L) + DN BTR ENABLE BIT M0: (L)

19 Rung 2:9 This rung checks the analog input data (4 to 20MA input) to ensure that it is within the proper range and turns on outputs for under and over range. If the value is within range it is scaled to the 4 to 20MA analog output range and is then placed into the BTW data area. The BTW enable bit and pending bits are then latched to initiate the BTW to the analog combination module, output 0. Output 0 is connected to a meter to display the current range in percent. GOOD BTR BELOW DATA BIT RANGE FLAG B3:0 +LES + O:2.0 ] [ + +LESS THAN + È (L) + 2 Source A N7: Source B ABOVE RANGE FLAG +GRT + O: GREATER THAN + È (L) + Source A N7: Source B LIM + +SCL + + +LIMIT TEST + + +SCALE Low Lim 3277 Source N7:10 0 Test N7:10 Rate [/10000] High Lim Offset Dest M0:1.210 * + + SERVICE THE BTW STATUS/ BTW ENABLE BTW DONE BTW BIT BIT PENDING M0:1.200 M1:1.200 B3:0 + ]/[ ]/[ + (L) BTW ENABLE BIT M0: (L) + 15 B3:0 (U) 2 Rung 2:10 +END+ È 19

20 Allen-Bradley Support In today s competitive environment, when you buy any product, you expect that product to meet your needs. You also expect the manufacturer of that product to back it up with the kind of customer service and product support that will prove you made a wise purchase. As the people who design, engineer, and manufacture your Industrial Automation Control equipment, Allen-Bradley has a vested interest in your complete satisfaction with our products and services. Allen-Bradley offers support services worldwide, with over 75 Sales/Support Offices, 512 authorized Distributors and 260 authorized Systems Integrators located throughout the United States alone, plus Allen-Bradley representatives in every major country in the world. Contact your local Allen-Bradley representative for: sales and order support product technical training warranty support support service agreements 20

21 Specifications The following tables provide operating and network specifications. Operating Specifications Description Specification Backplane Current Consumption 600 ma at 5V dc Operating Temperature +32 F to 140 F (0 to 60 C) Storage Temperature 40 F to +185 F ( 40 C to +85 C) Humidity 5 to 95% without condensation Noise Immunity NEMA Standard ICS Agency Certification (when product or packaging is marked) CSA certified CSA Class I, Division 2 Groups A, B, C, D certified UL listed CE marked for all applicable directives Network Specifications Baud Rate Determination of Maximum Cable Length and Terminating Resistor Size Baud Rate Maximum Cable Distance Terminating Resistor Size 57.6K baud 3048 meters (10,000 feet) K baud 1525 meters (5,000 feet) K baud 750 meters (2,500 feet) 82 DIP Switch Position for Baud Rate Selection Baud Rate SW 1 SW K baud 1 ON 1 ON 115.2K baud 1 ON 0 OFF 230.4K baud 0 OFF 1 ON 230.4K baud 0 OFF 0 OFF 21

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